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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 9,086,256 | $ 7,623,663
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 9,083,129 | 7,620,322
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,295,912 | 1,039,393
Loans, net of unearned income | 1,295,912 | 1,039,393
Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 64,992 | 57,354
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 740,668 | 633,389
Loans, net of unearned income | 740,668 | 633,389
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,795,343 | 2,343,721
Loans, net of unearned income | 2,795,343 | 2,343,721
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 4,051,509 | 3,427,530
Loans, net of unearned income | 4,051,509 | 3,427,530
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 137,832 | 122,276
Loans, net of unearned income | 199,697 | 176,289
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,693,417 | 2,031,766
Unearned income | 0 | 0
Loans, net of unearned income | 2,693,417 | 2,031,766
Purchased | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,661,269 | 2,010,852
Unearned income | 0 | 0
Loans, net of unearned income | 2,687,581 | 2,027,342
Purchased | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 19,080 | 10,759
Purchased | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 7,232 | 5,731
Purchased | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,849 | 2,612
Unearned income | 0 | 0
Loans, net of unearned income | 5,836 | 4,424
Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 204 | 635
Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 3,783 | 1,177
Purchased | Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 420,263 | 275,570
Purchased | Commercial, financial, agricultural | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 417,786 | 273,488
Total loans, gross | 419,694 | 275,139
Purchased | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,811 | 1,119
Purchased | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 97 | 532
Purchased | Commercial, financial, agricultural | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 92 | 232
Total loans, gross | 569 | 431
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 477 | 199
Purchased | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 105,149 | 85,731
Purchased | Real estate – construction | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 103,846 | 85,316
Total loans, gross | 105,149 | 85,731
Purchased | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,235 | 415
Purchased | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 68 | 0
Purchased | Real estate – construction | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Real estate – construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 707,453 | 614,187
Purchased | Real estate – 1-4 family mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 690,697 | 602,464
Total loans, gross | 704,133 | 610,814
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 8,981 | 6,070
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 4,455 | 2,280
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,237 | 2,109
Total loans, gross | 3,320 | 3,373
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 202 | 385
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,881 | 879
Purchased | Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,423,144 | 1,037,454
Purchased | Real estate – commercial mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,413,346 | 1,031,141
Total loans, gross | 1,421,467 | 1,036,998
Purchased | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 5,711 | 2,947
Purchased | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,410 | 2,910
Purchased | Real estate – commercial mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 276 | 166
Total loans, gross | 1,677 | 456
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 191
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,401 | 99
Purchased | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 37,408 | 18,824
Purchased | Installment loans to individuals | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 35,594 | 18,443
Total loans, gross | 37,138 | 18,660
Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,342 | 208
Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 202 | 9
Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 244 | 105
Total loans, gross | 270 | 164
Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2 | 59
Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | $ 24 | $ 0

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